<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>控制面板</title>
    <!-- Tell the browser to be responsive to screen width -->
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- Theme style -->
    <link rel="stylesheet"
          href="https://adminlte.io/themes/AdminLTE/bower_components/bootstrap/dist/css/bootstrap.min.css">
    <link rel="stylesheet" href="https://adminlte.io/themes/AdminLTE/dist/css/AdminLTE.min.css">
    <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script>
        <style type="text/css">
        .float {
            float: left;
            width: 200px;
            height: 200px;
            overflow: hidden;
            border: 1px solid #CCCCCC;
            border-radius: 10px;
            padding: 5px;
            margin: 5px;
        }

        img {
            position: relative;
        }

        .result {
            width: 200px;
            height: 200px;
            text-align: center;
            box-sizing: border-box;
        }


        #file_input {
            display: none;
        }


        .delete {
            width: 200px;
            height: 200px;
            position: absolute;
            text-align: center;
            line-height: 200px;
            z-index: 10;
            font-size: 30px;
            background-color: rgba(255, 255, 255, 0.8);
            color: #777;
            opacity: 0;
            transition-duration: 0.7s;
            -webkit-transition-duration: 0.7s;
        }


        .delete:hover {
            cursor: pointer;
            opacity: 1;
        }


    </style>
    <script type="text/javascript">
        window.onload = function () {
            var input = document.getElementById("file_input");
            var result;
            var dataArr = []; // 储存所选图片的结果(文件名和base64数据)
            var fd;  //FormData方式发送请求
            var oSelect = document.getElementById("select");
            var oAdd = document.getElementById("add");
            var oSubmit = document.getElementById("submit_picture");
            var oSubmit1 = document.getElementById("submit_picture1");
            var oInput = document.getElementById("file_input");

            if (typeof FileReader === 'undefined') {
                alert("抱歉，你的浏览器不支持 FileReader");
                input.setAttribute('disabled', 'disabled');
            } else {
                input.addEventListener('change', readFile, false);
            }　　　　　//handler


            function readFile() {
                fd = new FormData();
                var iLen = this.files.length;
                for (var i = 0; i < iLen; i++) {
                    if (!input['value'].match(/.jpg|.gif|.png|.jpeg|.bmp|.DNG/i)) {　　//判断上传文件格式
                        return alert("上传的图片格式不正确，请重新选择");
                    }
                    var reader = new FileReader();
                    fd.append(i, this.files[i]);
                    reader.readAsDataURL(this.files[i]);  //转成base64
                    reader.fileName = this.files[i].name;

                    reader.onload = function (e) {
                        var imgMsg = {
                            name: this.fileName,//获取文件名
                            base64: this.result   //reader.readAsDataURL方法执行完后，base64数据储存在reader.result里
                        }
                        dataArr.push(imgMsg);
                        result = '<div class="delete">delete</div><div class="result"><img class="subPic" src="' + this.result + '" alt="' + this.fileName + '"/></div>';
                        var div = document.createElement('div');
                        div.innerHTML = result;
                        div['className'] = 'float';
                        document.getElementsByTagName('p')[1].appendChild(div);  　　//插入dom树
                        var img = div.getElementsByTagName('img')[0];
                        img.onload = function () {
                            var nowHeight = ReSizePic(this); //设置图片大小
                            this.parentNode.style.display = 'block';
                            var oParent = this.parentNode;
                            if (nowHeight) {
                                oParent.style.paddingTop = (oParent.offsetHeight - nowHeight) / 2 + 'px';
                            }
                        }
                        div.onclick = function () {
                            $(this).remove();                  // 在页面中删除该图片元素
                        }
                    }
                }
            }


            function send() {
                var paths = document.getElementById("file_input").files;
                if (paths.length == 0) {
                    alert("请选择文件");
                    return;
                }
                var formData = new FormData();
                $('.subPic').each(function () {
                        for (var i = 0; i < paths.length; i++) {
                            if ($(this).attr('alt') == paths[i].name) {
                                formData.append('files', paths[i]);
                            }
                        }
                    }
                );
                formData.append('album_id', self.id);
                formData.append('status', 1);
                $.ajax({
                    url: '/upload/',
                    type: 'post',
                    data: formData,
                    async: true,
                    dataType: 'formData',
                    processData: false,   //用FormData传fd时需有这两项
                    contentType: false,
                    success: function (data) {
                        console.log('返回的数据：' + JSON.stringify(data))
                    }
                })
            }


            oSelect.onclick = function () {
                oInput.value = "";   // 先将oInput值清空，否则选择图片与上次相同时change事件不会触发
                //清空已选图片
                $('.float').remove();
                oInput.click();
            }


            oAdd.onclick = function () {
                oInput.value = "";   // 先将oInput值清空，否则选择图片与上次相同时change事件不会触发
                oInput.click();
            }


            oSubmit.onclick = function () {
                if (!dataArr.length) {
                    return alert('请先选择文件');
                }
                send();
            }

            oSubmit1.onclick = function () {
                window.open ("picture.html", "newwindow", "height=1000, width=1000, top=50%, left=50%, toolbar=no, menubar=no, scrollbars=no, resizable=no, location=no, status=no")
            }
        }

        /*
         用ajax发送fd参数时要告诉jQuery不要去处理发送的数据，
         不要去设置Content-Type请求头才可以发送成功，否则会报“Illegal invocation”的错误，
         也就是非法调用，所以要加上“processData: false,contentType: false,”
         * */


        function ReSizePic(ThisPic) {
            var RePicWidth = 200; //这里修改为您想显示的宽度值

            var TrueWidth = ThisPic.width; //图片实际宽度
            var TrueHeight = ThisPic.height; //图片实际高度

            if (TrueWidth > TrueHeight) {
                //宽大于高
                var reWidth = RePicWidth;
                ThisPic.width = reWidth;
                //垂直居中
                var nowHeight = TrueHeight * (reWidth / TrueWidth);
                return nowHeight;  //将图片修改后的高度返回，供垂直居中用
            } else {
                //宽小于高
                var reHeight = RePicWidth;
                ThisPic.height = reHeight;
            }
        }
    </script>


</head>
<body>
<div class="wrapper">
    <!-- Main content -->
    <p class="title111">
    <div class="container">
        <label>请选择一个图像文件：</label>
        <button id="select">(重新)选择图片</button>
        <button id="add">(追加)图片</button>
        <input type="file" id="file_input" multiple/>
        <button id="submit_picture">上传文件</button>
        <button id="submit_picture1">上传文件弹窗</button>
    </div>
    </p>
    <p class="upload_picture" >


    </p>
    <div class="row">
        {% for my_picture in data %}
            <div class="col-sm-3">
                <!-- small box -->
                <div class="small-box bg-info">
                    <div class="inner">
                        <img src={{ my_picture.picture_url }}/admin_min />
                    </div>
                    <div class="icon">
                        <i class="ion ion-bag"></i>
                    </div>
                    <!--
                    <a class="small-box-footer">{{ my_picture.picture_name }} <i class="fas fa-arrow-circle-right"></i></a>
                    -->
                </div>
            </div>
        {% endfor %}`

        <!-- ./col -->
    </div>
</div>
</body>